[Ada] Remove obsolete figure in documentation

2018-05-31  Pierre-Marie de Rodat  <derodat@adacore.com>

gcc/ada/

	* doc/gnat_ugn/project-manager-figure.png: Delete.

From-SVN: r261018

gcc/ada/ChangeLog

 2018-05-31  Pierre-Marie de Rodat  <derodat@adacore.com>
 
+	* doc/gnat_ugn/project-manager-figure.png: Delete.
+
+2018-05-31  Pierre-Marie de Rodat  <derodat@adacore.com>
+
 	* vxworks-arm-link.spec, vxworks-e500-link.spec,
 	vxworks-gnat-crtbe-link.spec, vxworks-smp-arm-link.spec,
 	vxworks-smp-e500-link.spec, vxworks-smp-ppc-link.spec,